CN103500984A - Circuit of miniature residual current circuit breaker - Google Patents

Circuit of miniature residual current circuit breaker Download PDF

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Publication number
CN103500984A
CN103500984A CN201310463693.3A CN201310463693A CN103500984A CN 103500984 A CN103500984 A CN 103500984A CN 201310463693 A CN201310463693 A CN 201310463693A CN 103500984 A CN103500984 A CN 103500984A
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China
Prior art keywords
circuit
residual current
resistance
current detection
capacitor
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CN201310463693.3A
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CN103500984B (en
Inventor
余存泰
赵东杰
彭昆明
黎永胜
李其利
杨晓红
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Great Wall Electrical Appliance Group Zhejiang Technology Co., Ltd.
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CNC Electric Group Co Ltd
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Abstract

The invention relates to a circuit of a miniature residual current circuit breaker. The circuit of the miniature residual current circuit breaker comprises a power supply circuit, and is characterized by also comprising a residual current signal conditioning circuit, a residual current detection control unit, a residual current detection control unit required circuit, a residual current testing circuit and a tripping circuit, wherein the residual current signal conditioning circuit, the residual current detection control unit, the residual current detection control unit required circuit, the residual current testing circuit and the tripping circuit are connected in sequence. According to the circuit of the miniature residual current circuit breaker provided by the invention, the temperature rise of a dropping resistor is reduced, and the product reliability is improved; the phenomenon that false phenomenon can be easily caused due to the fact that the pulse packet resistance of a product is low when no external voltage stabilizing circuit exists is improved. The whole circuit of the miniature residual current circuit breaker is simple in design, strong in EMC (electromagnetic compatibility) resistance, high in reliability and low in cost, and more meets the actual demand of the miniature residual current circuit breaker.

Description

The small-sized residual current circuit breaker circuit
Technical field
The present invention relates to the breaker circuit field, more particularly, relate to a kind of small-sized residual current circuit breaker circuit.
Background technology
In the power circuit of small-sized residual current circuit breaker, generally adopt at present the form of full-wave rectification and resistance step-down, because its VD of full-wave rectifying circuit approximates 0.9 times of AC-input voltage; Be the operating current of cooperation residual current detection unit and the requirement of product structure volume simultaneously, the resistance reduction voltage circuit can't adopt dropping resistor high-power, large resistance, general method is to adopt the method for two resistance series connection to reduce temperature rise, so that dropping resistor temperature rise ratio when normal operation is higher, thereby reduce the reliability of whole circuit working; Simultaneously due to without external voltage stabilizing circuit, and only adopt the voltage stabilizing circuit of residual current detection control unit inside, cause the ability of the anti-impulse train interference of product, easily produce the false tripping phenomenon.
Summary of the invention
The technical problem to be solved in the present invention is, the ability of disturbing for the anti-impulse train of the said goods of prior art, easily produce the defect of dropping resistor temperature rise in false tripping phenomenon and power circuit, a kind of small-sized residual current circuit breaker circuit is provided, at least comprise: power circuit; The residual current signal conditioning circuit; The residual current detection control unit; The required circuit of residual current detection control unit; The residual current hookup; Trip circuit; Wherein, described residual current signal conditioning circuit, residual current detection control unit, the required circuit of residual current detection control unit, residual current hookup, trip circuit are connected successively.
In small-sized residual current circuit breaker circuit of the present invention, described residual current signal conditioning circuit is by resistance R 3, R4, R5, and capacitor C 2, C6, C8, C9 and diode D4 form; Resistance R 3, R4, R5 are connected in series, and capacitor C 6, C8, C9 are connected in series, and capacitor C 2 is connected in series between resistance R 4 and resistance R 5, and diode D4 and resistance R 3 are connected in parallel.
In small-sized residual current circuit breaker circuit of the present invention, described power circuit is comprised of surge restraint circuit, half-wave rectifying circuit, resistance reduction voltage circuit, external voltage stabilizing circuit, filter circuit and release; Wherein said surge restraint circuit consists of piezo-resistance MYR1, half-wave rectifying circuit consists of diode D1, and the resistance reduction voltage circuit consists of resistance R 2, and external voltage stabilizing circuit consists of voltage stabilizing didoe D2, filter circuit consists of capacitor C 1, and release is comprised of release Trip.
In small-sized residual current circuit breaker circuit of the present invention, described residual current detection control unit is comprised of residual current detection integrated circuit U1.
In small-sized residual current circuit breaker circuit of the present invention, described residual current hookup is comprised of resistance R 1.
In small-sized residual current circuit breaker circuit of the present invention, described trip circuit is by controllable silicon D3, and resistance R 6 and capacitor C 5, C7 form.
In small-sized residual current circuit breaker circuit of the present invention, described residual current detection integrated circuit U1 refers to VG54123.
In small-sized residual current circuit breaker circuit of the present invention, the required circuit of described residual current detection control unit is comprised of capacitor C 3, C4; Capacitor C 3 is connected with the pin 6 of described residual current detection integrated circuit U1; Capacitor C 4 is connected with pin 4, the pin 5 of described residual current detection integrated circuit U1.
In small-sized residual current circuit breaker circuit of the present invention, it is characterized in that, be connected to capacitor C 2 between the pin 1 of described residual current detection integrated circuit U1, pin 2; Be connected to capacitor C 1 between the pin 3 of described residual current detection integrated circuit U1, pin 8.
Implement small-sized residual current circuit breaker circuit of the present invention, there is following beneficial effect: reduce the temperature rise of dropping resistor in power circuit, improved the reliability of product; Low, the phenomenon that easily causes false tripping of the ability of the anti-impulse train of product while avoiding without external voltage stabilizing circuit, simple, the anti-EMC performance of whole circuit design is strong and reliability is high, more meets the actual demand of small-sized residual current circuit breaker.
The accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is prior art small-sized residual current circuit breaker power circuit principle figure;
Fig. 2 is small-sized residual current circuit breaker circuit theory diagrams of the present invention.
Embodiment
Refer to Fig. 1, Fig. 1 is prior art small-sized residual current circuit breaker power circuit principle figure.As shown in Figure 1, generally adopt the form of full-wave rectification and resistance step-down in prior art, its defect is: dropping resistor temperature rise ratio when normal operation is higher, thereby reduces the reliability of whole circuit working; Due to without external voltage stabilizing circuit, and only adopt the voltage stabilizing circuit of residual current detection control unit inside, the ability that causes the anti-impulse train of product to disturb, easily produce the false tripping phenomenon.
Refer to Fig. 2, Fig. 2 is small-sized residual current circuit breaker circuit theory diagrams of the present invention.As shown in Figure 2, a kind of small-sized residual current circuit breaker circuit comprises: power circuit also comprises: the residual current signal conditioning circuit; The residual current detection control unit; The required circuit of residual current detection control unit; The residual current hookup; Trip circuit; Wherein, described residual current signal conditioning circuit, residual current detection control unit, the required circuit of residual current detection control unit, residual current hookup, trip circuit are connected successively.
Preferably, described residual current signal conditioning circuit is by resistance R 3, R4, R5, and capacitor C 2, C6, C8, C9 and diode D4 form; Resistance R 3, R4, R5 are connected in series, and capacitor C 6, C8, C9 are connected in series, and capacitor C 2 is connected in series between resistance R 4 and resistance R 5, and diode D4 and resistance R 3 are connected in parallel.
Preferably, described power circuit is comprised of surge restraint circuit, half-wave rectifying circuit, resistance reduction voltage circuit, external voltage stabilizing circuit, filter circuit and release; Wherein said surge restraint circuit consists of piezo-resistance MYR1, half-wave rectifying circuit consists of diode D1, and the resistance reduction voltage circuit consists of resistance R 2, and external voltage stabilizing circuit consists of voltage stabilizing didoe D2, filter circuit consists of capacitor C 1, and release is comprised of release Trip.
Preferably, described residual current detection control unit is comprised of residual current detection integrated circuit U1.
Preferably, described residual current hookup is comprised of resistance R 1.
Preferably, in described small-sized residual current circuit breaker circuit, described trip circuit is by controllable silicon D3, and resistance R 6 and capacitor C 5, C7 form.
Preferably, described small-sized residual current circuit breaker circuit, described residual current detection integrated circuit U1 refers to VG54123.
Preferably, described residual current detection control unit circuit is comprised of capacitor C 3, C4; Capacitor C 3 is connected with the pin 6 of described residual current detection integrated circuit U1; Capacitor C 4 is connected with pin 4, the pin 5 of described residual current detection integrated circuit U1.
Preferably, be connected to capacitor C 2 between the pin 1 of described residual current detection integrated circuit U1, pin 2; Be connected to capacitor C 1 between the pin 3 of described residual current detection integrated circuit U1, pin 8.
Unique distinction of the present invention is the form of halfwave rectifier, adopts external voltage stabilizing circuit simultaneously.
The present invention is by the design of above schematic diagram, its beneficial effect is: one, rectification circuit in the power circuit of small-sized residual current circuit breaker of the present invention adopts the form of halfwave rectifier, its VD approximates 0.45 times of AC-input voltage, the input voltage that makes whole resistance reduction voltage circuit reduces approximately half than the reduction voltage circuit in current common small sized residual current circuit breaker power circuit, so do not need to adopt high-power, the dropping resistor of large resistance, do not need the method for two resistance series connection to reduce the temperature rise that resistance heating produces yet, not only simplify the design of circuit, and greatly reduce the temperature rise of dropping resistor, improved the reliability of product, while two, adopting external voltage stabilizing circuit greatly to improve without external voltage stabilizing circuit, the ability of the anti-impulse train of product is low, easily causes the phenomenon of false tripping, three, simple, the anti-EMC performance of whole circuit design is strong and reliability is high, more meets the actual demand of small-sized residual current circuit breaker.
The present invention is described according to specific embodiment, but it will be understood by those skilled in the art that when not breaking away from the scope of the invention, can carry out various variations and be equal to replacement.In addition, for adapting to the specific occasion of the technology of the present invention, can carry out many modifications and not break away from its protection range the present invention.Therefore, the present invention is not limited to specific embodiment disclosed herein, and comprises all embodiment that drop into the claim protection range.

Claims (9)

1. a small-sized residual current circuit breaker circuit comprises: power circuit, it is characterized in that, and described small-sized residual current circuit breaker circuit also comprises:
The residual current signal conditioning circuit;
The residual current detection control unit;
The required circuit of residual current detection control unit;
The residual current hookup;
Trip circuit;
Wherein, described residual current signal conditioning circuit, residual current detection control unit, the required circuit of residual current detection control unit, residual current hookup, trip circuit are connected successively.
2. small-sized residual current circuit breaker circuit according to claim 1, is characterized in that, described residual current signal conditioning circuit is by resistance R 3, R4, R5, and capacitor C 2, C6, C8, C9 and diode D4 form; Resistance R 3, R4, R5 are connected in series, and capacitor C 6, C8, C9 are connected in series, and capacitor C 2 is connected in series between resistance R 4 and resistance R 5, and diode D4 and resistance R 3 are connected in parallel.
3. small-sized residual current circuit breaker circuit according to claim 1, is characterized in that, described power circuit is comprised of surge restraint circuit, half-wave rectifying circuit, resistance reduction voltage circuit, external voltage stabilizing circuit, filter circuit and release; Wherein said surge restraint circuit consists of piezo-resistance MYR1, half-wave rectifying circuit consists of diode D1, and the resistance reduction voltage circuit consists of resistance R 2, and external voltage stabilizing circuit consists of voltage stabilizing didoe D2, filter circuit consists of capacitor C 1, and release is comprised of release Trip.
4. small-sized residual current circuit breaker circuit according to claim 1, is characterized in that, described residual current detection control unit is comprised of residual current detection integrated circuit U1.
5. small-sized residual current circuit breaker circuit according to claim 1, is characterized in that, described residual current hookup is comprised of resistance R 1.
6. small-sized residual current circuit breaker circuit according to claim 1, is characterized in that, described trip circuit is by controllable silicon D3, and resistance R 6 and capacitor C 5, C7 form.
7. small-sized residual current circuit breaker circuit according to claim 4, is characterized in that, described residual current detection integrated circuit U1 refers to VG54123.
8. small-sized residual current circuit breaker circuit according to claim 4, is characterized in that, the required circuit of described residual current detection control unit is comprised of capacitor C 3, C4; Capacitor C 3 is connected with the pin 6 of described residual current detection integrated circuit U1; Capacitor C 4 is connected with pin 4, the pin 5 of described residual current detection integrated circuit U1.
9. according to claim 2,3 or 4 described small-sized residual current circuit breaker circuit, it is characterized in that, between the pin 1 of described residual current detection integrated circuit U1, pin 2, be connected to capacitor C 2; Be connected to capacitor C 1 between the pin 3 of described residual current detection integrated circuit U1, pin 8.
CN201310463693.3A 2013-10-08 2013-10-08 Circuit of miniature residual current circuit breaker Active CN103500984B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104577979A (en) * 2015-01-28 2015-04-29 长城电器集团有限公司 Novel residual current circuit-breaker circuit
CN104577978A (en) * 2015-01-28 2015-04-29 长城电器集团有限公司 Time-delayed residual current circuit-breaker circuit
CN104577972A (en) * 2015-01-28 2015-04-29 长城电器集团有限公司 Minitype residual current protective circuit
CN106663939A (en) * 2014-07-16 2017-05-10 伊顿工业(奥地利)有限公司 Device to reduce residual current

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101478099A (en) * 2008-01-04 2009-07-08 创奇科技有限公司 Neutral grounding fault creepage protecting plug
CN202940564U (en) * 2012-11-05 2013-05-15 厦门盈瑞丰电子科技有限公司 Three-phase leakage circuit breaker
CN103500983A (en) * 2013-09-30 2014-01-08 长城电器集团有限公司 Circuit of miniature electric leakage circuit breaker
CN203589692U (en) * 2013-10-08 2014-05-07 长城电器集团有限公司 Circuit of miniature residual current circuit breaker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101478099A (en) * 2008-01-04 2009-07-08 创奇科技有限公司 Neutral grounding fault creepage protecting plug
CN202940564U (en) * 2012-11-05 2013-05-15 厦门盈瑞丰电子科技有限公司 Three-phase leakage circuit breaker
CN103500983A (en) * 2013-09-30 2014-01-08 长城电器集团有限公司 Circuit of miniature electric leakage circuit breaker
CN203589692U (en) * 2013-10-08 2014-05-07 长城电器集团有限公司 Circuit of miniature residual current circuit breaker

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106663939A (en) * 2014-07-16 2017-05-10 伊顿工业(奥地利)有限公司 Device to reduce residual current
US10361555B2 (en) 2014-07-16 2019-07-23 Eaton Intelligent Power Limited Device to reduce residual current
CN106663939B (en) * 2014-07-16 2019-12-03 伊顿工业(奥地利)有限公司 For reducing the device of residual current
CN104577979A (en) * 2015-01-28 2015-04-29 长城电器集团有限公司 Novel residual current circuit-breaker circuit
CN104577978A (en) * 2015-01-28 2015-04-29 长城电器集团有限公司 Time-delayed residual current circuit-breaker circuit
CN104577972A (en) * 2015-01-28 2015-04-29 长城电器集团有限公司 Minitype residual current protective circuit

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Effective date of registration: 20200122

Address after: 325603 no.2-1, Baixiang Avenue, beibaixiang Town, Yueqing City, Wenzhou City, Zhejiang Province (South Building)

Patentee after: Great Wall Electrical Appliance Group Zhejiang Technology Co., Ltd.

Address before: 325000 No. 2-1, white elephant Avenue, North white elephant Town, Zhejiang, Yueqing

Patentee before: CNC Electric Group Co.,Ltd.